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ABOUT THIS IMAGE:

This image of galaxy cluster MS 0735.6+7421 was taken with NASA's Hubble
Space Telescope in February 2006. The Advanced Camera for Surveys image
shows dozens of galaxies bound together by gravity. Diffuse, hot gas with a
temperature of nearly 50 million degrees permeates the space between the galaxies.
A supermassive black hole weighing nearly a billion times the mass of our Sun lurks
in the nucleus of the bright central galaxy.